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Sergey Senozhatsky 69d94ec6d8 Battery: sysfs_remove_battery(): possible circular locking 
Commit 9c921c22a7
Author: Lan Tianyu <tianyu.lan@intel.com>

    ACPI / Battery: Resolve the race condition in the sysfs_remove_battery()

fixed BUG https://bugzilla.kernel.org/show_bug.cgi?id=35642 , but as a side
effect made lockdep unhappy with sysfs_remove_battery():

[14818.477168]
[14818.477170] =======================================================
[14818.477200] [ INFO: possible circular locking dependency detected ]
[14818.477221] 3.1.0-dbg-07865-g1280ea8-dirty #668
[14818.477236] -------------------------------------------------------
[14818.477257] s2ram/1599 is trying to acquire lock:
[14818.477276]  (s_active#8){++++.+}, at: [<ffffffff81169147>] sysfs_addrm_finish+0x31/0x5a
[14818.477323]
[14818.477325] but task is already holding lock:
[14818.477350]  (&battery->lock){+.+.+.}, at: [<ffffffffa0047278>] sysfs_remove_battery+0x10/0x4b [battery]
[14818.477395]
[14818.477397] which lock already depends on the new lock.
[14818.477399]
[..]
[14818.479121] stack backtrace:
[14818.479148] Pid: 1599, comm: s2ram Not tainted 3.1.0-dbg-07865-g1280ea8-dirty #668
[14818.479175] Call Trace:
[14818.479198]  [<ffffffff814828c3>] print_circular_bug+0x293/0x2a4
[14818.479228]  [<ffffffff81070cb5>] __lock_acquire+0xfe4/0x164b
[14818.479260]  [<ffffffff81169147>] ? sysfs_addrm_finish+0x31/0x5a
[14818.479288]  [<ffffffff810718d2>] lock_acquire+0x138/0x1ac
[14818.479316]  [<ffffffff81169147>] ? sysfs_addrm_finish+0x31/0x5a
[14818.479345]  [<ffffffff81168a79>] sysfs_deactivate+0x9b/0xec
[14818.479373]  [<ffffffff81169147>] ? sysfs_addrm_finish+0x31/0x5a
[14818.479405]  [<ffffffff81169147>] sysfs_addrm_finish+0x31/0x5a
[14818.479433]  [<ffffffff81167bc5>] sysfs_hash_and_remove+0x54/0x77
[14818.479461]  [<ffffffff811681b9>] sysfs_remove_file+0x12/0x14
[14818.479488]  [<ffffffff81385bf8>] device_remove_file+0x12/0x14
[14818.479516]  [<ffffffff81386504>] device_del+0x119/0x17c
[14818.479542]  [<ffffffff81386575>] device_unregister+0xe/0x1a
[14818.479570]  [<ffffffff813c6ef9>] power_supply_unregister+0x23/0x27
[14818.479601]  [<ffffffffa004729c>] sysfs_remove_battery+0x34/0x4b [battery]
[14818.479632]  [<ffffffffa004778f>] battery_notify+0x2c/0x3a [battery]
[14818.479662]  [<ffffffff8148fe82>] notifier_call_chain+0x74/0xa1
[14818.479692]  [<ffffffff810624b4>] __blocking_notifier_call_chain+0x6c/0x89
[14818.479722]  [<ffffffff810624e0>] blocking_notifier_call_chain+0xf/0x11
[14818.479751]  [<ffffffff8107e40e>] pm_notifier_call_chain+0x15/0x27
[14818.479770]  [<ffffffff8107ee1a>] enter_state+0xa7/0xd5
[14818.479782]  [<ffffffff8107e341>] state_store+0xaa/0xc0
[14818.479795]  [<ffffffff8107e297>] ? pm_async_store+0x45/0x45
[14818.479807]  [<ffffffff81248837>] kobj_attr_store+0x17/0x19
[14818.479820]  [<ffffffff81167e27>] sysfs_write_file+0x103/0x13f
[14818.479834]  [<ffffffff81109037>] vfs_write+0xad/0x13d
[14818.479847]  [<ffffffff811092b2>] sys_write+0x45/0x6c
[14818.479860]  [<ffffffff81492f92>] system_call_fastpath+0x16/0x1b

This patch introduces separate lock to struct acpi_battery to
grab in sysfs_remove_battery() instead of battery->lock.
So fix by Lan Tianyu is still there, we just grab independent lock.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Tested-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-05 22:15:18 -04:00
..
accessibility
acpi Battery: sysfs_remove_battery(): possible circular locking 2011-08-05 22:15:18 -04:00
amba
ata ahci: change 'masking port_map' printk to KERN_WARNING level 2011-06-29 10:10:07 -07:00
atm
auxdisplay
base mm: Move definition of MIN_MEMORY_BLOCK_SIZE to a header 2011-07-12 11:08:01 +10:00
bcma
block Merge branch 'for-3.0-important' of git://git.drbd.org/linux-2.6-drbd into for-linus 2011-06-30 10:10:50 +02:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 into for-davem 2011-06-17 12:40:36 -04:00
cdrom block: fix mismerge of the DISK_EVENT_MEDIA_CHANGE removal 2011-06-02 05:29:19 +09:00
char drivers/char/hpet.c: fix periodic-emulation for delayed interrupts 2011-06-15 20:04:02 -07:00
clk
clocksource
connector Connector: Correctly set the error code in case of success when dispatching receive callbacks 2011-06-07 12:02:00 -07:00
cpufreq [CPUFREQ] fix cpumask memory leak in acpi-cpufreq on cpu hotplug. 2011-07-10 17:03:04 -04:00
cpuidle
crypto crypto: caam - fix operator precedence in shared descriptor allocation 2011-06-30 07:43:27 +08:00
dca
dio
dma dmaengine: shdma: SH_DMAC_MAX_CHANNELS message fix 2011-06-14 15:03:07 +09:00
edac
eisa
firewire firewire: ohci: do not bind to Pinnacle cards, avert panic 2011-07-10 12:53:27 +02:00
firmware Merge branch 'driver-core-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2011-06-28 11:15:36 -07:00
gpio gpio/langwell_gpio: ack the correct bit for langwell gpio interrupts 2011-07-08 09:32:01 -06:00
gpu Merge branch 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/keithp/linux-2.6 2011-07-12 14:18:00 -07:00
hid HID: hid-multitouch: add support for a new Lumio dual-touch panel 2011-06-24 13:41:11 +02:00
hwmon hwmon: (pmbus) Improve auto-detection of temperature status register 2011-07-10 08:54:29 -07:00
hwspinlock
i2c Merge branch 'for-30-rc5/all-i2c' of git://git.fluff.org/bjdooks/linux 2011-07-07 16:29:29 -07:00
ide ide-cd: signedness warning fix again 2011-06-11 15:06:48 -07:00
idle
ieee802154
infiniband RDMA: Check for NULL mode in .devnode methods 2011-07-04 15:53:28 -07:00
input input: pmic8xxx-pwrkey: Do not use mfd_get_data() 2011-07-05 10:38:43 +02:00
isdn gigaset: call module_put before restart of if_open() 2011-06-17 15:27:32 -04:00
leds drivers/leds/leds-pca9532.c: change driver name to be unique 2011-07-08 21:14:44 -07:00
lguest
macintosh
mca
md md: avoid endless recovery loop when waiting for fail device to complete. 2011-06-28 16:59:42 +10:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2011-07-11 16:43:27 -07:00
memstick
message
mfd w1: ds1wm: add a reset recovery parameter 2011-07-08 21:14:44 -07:00
misc Merge branch 'driver-core-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2011-06-28 11:15:36 -07:00
mmc ARM: 6980/1: mmci: use StartBitErr to detect bad connections 2011-07-06 20:46:04 +01:00
mtd powerpc/85xx: fix NAND_CMD_READID read bytes number 2011-06-22 06:08:48 -05:00
net ath5k: Add missing breaks in switch/case 2011-07-11 12:46:02 -07:00
nfc
nubus
of
oprofile
parisc
parport
pci PCI: conditional resource-reallocation through kernel parameter pci=realloc 2011-07-08 15:49:20 -07:00
pcmcia pcmcia: pxa2xx/vpac270: free gpios on exist rather than requesting 2011-07-11 14:26:34 +08:00
platform hp-wmi: fix use after free 2011-07-11 09:52:35 -04:00
pnp
power
pps
ps3
ptp ptp: Fix some locking bugs in ptp_read() 2011-06-01 19:29:10 -07:00
rapidio
regulator regulator: max8997: Fix setting inappropriate value for ramp_delay variable 2011-07-08 19:14:58 +01:00
rtc drivers/rtc/rtc-ds1307.c: add support for RTC device pt7c4338 2011-06-27 18:00:12 -07:00
s390 [S390] qdio: Split SBAL entry flags 2011-06-06 14:14:56 +02:00
sbus
scsi [SCSI] isci: fix checkpatch errors 2011-07-03 14:26:24 -05:00
sfi
sh drivers: sh: resume enabled clocks fix 2011-06-14 15:15:25 +09:00
sn
spi spi/s3c64xx: Bug fix for SPI with different FIFO level 2011-07-06 15:03:08 +09:00
ssb ssb: fix PCI(e) driver regression causing oops on PCI cards 2011-06-03 14:19:49 -04:00
staging Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2011-07-06 12:16:49 -07:00
target tcm_fc: Fix conversion spec warning 2011-06-24 00:09:16 +00:00
tc
telephony
thermal
tty Merge branch 'at91/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-2.6-arm-soc 2011-07-04 15:54:18 -07:00
uio
usb USB: additional regression fix for device removal 2011-07-07 13:29:33 -07:00
uwb
vhost
video vesafb: fix memory leak 2011-07-04 16:02:48 +09:00
virtio
vlynq
w1 w1: ds1wm: add a reset recovery parameter 2011-07-08 21:14:44 -07:00
watchdog watchdog: update author email for at32ap700x_wdt 2011-06-28 20:01:25 +00:00
xen Merge branch 'stable/bug.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-06-20 09:01:33 -07:00
zorro
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